drivers/staging/iio/iio_simple_dummy.h

   1 /**
   2  * Copyright (c) 2011 Jonathan Cameron
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 as published by
   6  * the Free Software Foundation.
   7  *
   8  * Join together the various functionality of iio_simple_dummy driver
   9  */
  10
  11 #include <linux/kernel.h>
  12
  13 struct iio_dummy_accel_calibscale;
  14
  15 /**
  16  * struct iio_dummy_state - device instance specific state.
  17  * @dac_val:                    cache for dac value
  18  * @single_ended_adc_val:       cache for single ended adc value
  19  * @differential_adc_val:       cache for differential adc value
  20  * @accel_val:                  cache for acceleration value
  21  * @accel_calibbias:            cache for acceleration calibbias
  22  * @accel_calibscale:           cache for acceleration calibscale
  23  * @lock:                       lock to ensure state is consistent
  24  * @event_irq:                  irq number for event line (faked)
  25  * @event_val:                  cache for event theshold value
  26  * @event_en:                   cache of whether event is enabled
  27  */
  28 struct iio_dummy_state {
  29         int dac_val;
  30         int single_ended_adc_val;
  31         int differential_adc_val[2];
  32         int accel_val;
  33         int accel_calibbias;
  34         const struct iio_dummy_accel_calibscale *accel_calibscale;
  35         struct mutex lock;
  36 #ifdef CONFIG_IIO_SIMPLE_DUMMY_EVENTS
  37         int event_irq;
  38         int event_val;
  39         bool event_en;
  40 #endif /* CONFIG_IIO_SIMPLE_DUMMY_EVENTS */
  41 };
  42
  43 #ifdef CONFIG_IIO_SIMPLE_DUMMY_EVENTS
  44
  45 struct iio_dev;
  46
  47 int iio_simple_dummy_read_event_config(struct iio_dev *indio_dev,
  48                                        u64 event_code);
  49
  50 int iio_simple_dummy_write_event_config(struct iio_dev *indio_dev,
  51                                         u64 event_code,
  52                                         int state);
  53
  54 int iio_simple_dummy_read_event_value(struct iio_dev *indio_dev,
  55                                       u64 event_code,
  56                                       int *val);
  57
  58 int iio_simple_dummy_write_event_value(struct iio_dev *indio_dev,
  59                                        u64 event_code,
  60                                        int val);
  61
  62 int iio_simple_dummy_events_register(struct iio_dev *indio_dev);
  63 int iio_simple_dummy_events_unregister(struct iio_dev *indio_dev);
  64
  65 #else /* Stubs for when events are disabled at compile time */
  66
  67 static inline int
  68 iio_simple_dummy_events_register(struct iio_dev *indio_dev)
  69 {
  70         return 0;
  71 };
  72
  73 static inline int
  74 iio_simple_dummy_events_unregister(struct iio_dev *indio_dev)
  75 {
  76         return 0;
  77 };
  78
  79 #endif /* CONFIG_IIO_SIMPLE_DUMMY_EVENTS*/
  80
  81 /**
  82  * enum iio_simple_dummy_scan_elements - scan index enum
  83  * @voltage0:           the single ended voltage channel
  84  * @diffvoltage1m2:     first differential channel
  85  * @diffvoltage3m4:     second differenial channel
  86  * @accelx:             acceleration channel
  87  *
  88  * Enum provides convenient numbering for the scan index.
  89  */
  90 enum iio_simple_dummy_scan_elements {
  91         voltage0,
  92         diffvoltage1m2,
  93         diffvoltage3m4,
  94         accelx,
  95 };
  96
  97 #ifdef CONFIG_IIO_SIMPLE_DUMMY_BUFFER
  98 int iio_simple_dummy_configure_buffer(struct iio_dev *indio_dev,
  99         const struct iio_chan_spec *channels, unsigned int num_channels);
 100 void iio_simple_dummy_unconfigure_buffer(struct iio_dev *indio_dev);
 101 #else
 102 static inline int iio_simple_dummy_configure_buffer(struct iio_dev *indio_dev,
 103         const struct iio_chan_spec *channels, unsigned int num_channels)
 104 {
 105         return 0;
 106 };
 107 static inline
 108 void iio_simple_dummy_unconfigure_buffer(struct iio_dev *indio_dev)
 109 {};
 110 #endif /* CONFIG_IIO_SIMPLE_DUMMY_BUFFER */